there is a tendency to limit the use of luster, in this sense, to the brightness of things which do not shine with their own light, or at least do not blaze or glow with heat. One speaks of the luster of a diamond, or of silk, or even of the stars, but not often now of the luster of the sun, a coal of fire, or the like.
The principal kinds of luster recognised are: metallic, adamantine, vitreous, resinous, greasy, pearly, and silky. With respect to intensity, luster is characterised as splendent, shining, glistening, glimmering, and dull.
Origin: f. Lustre; cf. It. Lustro; both fr. L. Lustrare to purify, go about (like the priests at the lustral sacrifice), traverse, survey, illuminate, fr. Lustrum a purificatory sacrifice; perh. Akin to E. Loose. But lustrare to illuminate is perh. A different word, and akin to L. Lucere to be light or clear, to shine. See lucid, and cf. Illustrious, lustrum.